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<pre><span class="sourceLineNo">001</span>package org.nashua.tt151.util;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>/**<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Math utility methods<a name="line.4"></a>
<span class="sourceLineNo">005</span> * @author Brian Ashworth (Original Author: Brennan Ringey)<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span>public final class MathTools {<a name="line.7"></a>
<span class="sourceLineNo">008</span>    <a name="line.8"></a>
<span class="sourceLineNo">009</span>    /**<a name="line.9"></a>
<span class="sourceLineNo">010</span>     * Declared as private to force static usage<a name="line.10"></a>
<span class="sourceLineNo">011</span>     */<a name="line.11"></a>
<span class="sourceLineNo">012</span>    private MathTools() {<a name="line.12"></a>
<span class="sourceLineNo">013</span>    }<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>    /**<a name="line.15"></a>
<span class="sourceLineNo">016</span>     * Rounds a number up to a certain decimal place<a name="line.16"></a>
<span class="sourceLineNo">017</span>     * @param val - Raw number<a name="line.17"></a>
<span class="sourceLineNo">018</span>     * @param places - Decimal places<a name="line.18"></a>
<span class="sourceLineNo">019</span>     * @return Rounded up number<a name="line.19"></a>
<span class="sourceLineNo">020</span>     */<a name="line.20"></a>
<span class="sourceLineNo">021</span>    public static double ceil(double val, int places) {<a name="line.21"></a>
<span class="sourceLineNo">022</span>        return ((int) (val * pow(10, places))) / pow(10, places) + pow(10, -places);<a name="line.22"></a>
<span class="sourceLineNo">023</span>    }<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    /**<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * Rounds a number down to a certain decimal place<a name="line.26"></a>
<span class="sourceLineNo">027</span>     * @param val - Raw number<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * @param places - Decimal places<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * @return Rounded down number<a name="line.29"></a>
<span class="sourceLineNo">030</span>     */<a name="line.30"></a>
<span class="sourceLineNo">031</span>    public static double floor(double val, int places) {<a name="line.31"></a>
<span class="sourceLineNo">032</span>        return ((int) (val * pow(10, places))) / pow(10, places);<a name="line.32"></a>
<span class="sourceLineNo">033</span>    }<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    /**<a name="line.35"></a>
<span class="sourceLineNo">036</span>     * Raise base to the power exp<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * @param base The number to use for the base<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * @param exp The exponent to use for the power<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @return Base raised to the exp power<a name="line.39"></a>
<span class="sourceLineNo">040</span>     */<a name="line.40"></a>
<span class="sourceLineNo">041</span>    public static double pow(double base, int exp) {<a name="line.41"></a>
<span class="sourceLineNo">042</span>        if (exp&lt;0) {<a name="line.42"></a>
<span class="sourceLineNo">043</span>            return 1.0/pow(base, -exp);<a name="line.43"></a>
<span class="sourceLineNo">044</span>        }<a name="line.44"></a>
<span class="sourceLineNo">045</span>        if (exp==0) {<a name="line.45"></a>
<span class="sourceLineNo">046</span>            return 1;<a name="line.46"></a>
<span class="sourceLineNo">047</span>        }<a name="line.47"></a>
<span class="sourceLineNo">048</span>        double v = base;<a name="line.48"></a>
<span class="sourceLineNo">049</span>        for (int i=1; i&lt;exp; i++) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>            v *= base;<a name="line.50"></a>
<span class="sourceLineNo">051</span>        }<a name="line.51"></a>
<span class="sourceLineNo">052</span>        return v;<a name="line.52"></a>
<span class="sourceLineNo">053</span>    }<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>
<span class="sourceLineNo">055</span>    /**<a name="line.55"></a>
<span class="sourceLineNo">056</span>     * Round val to the closest number keeping places number of decimal places<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * @param val Original Value<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * @param places Number of decimal places to keep<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @return Val rounded to the closest number keeping places number decimal places<a name="line.59"></a>
<span class="sourceLineNo">060</span>     */<a name="line.60"></a>
<span class="sourceLineNo">061</span>    public static double round(double val, int places) {<a name="line.61"></a>
<span class="sourceLineNo">062</span>        return ((int) (val * pow(10, places))) % 10 &gt; 4 ? ceil(val, places) : floor(val, places);<a name="line.62"></a>
<span class="sourceLineNo">063</span>    }<a name="line.63"></a>
<span class="sourceLineNo">064</span>}<a name="line.64"></a>




























































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